GNU Info

(gprof.info)How do I?

---

Next: Incompatibilities Prev: Inaccuracy Up: Top

---

Enter node , (file) or (file)node

Answers to Common Questions
***************************

How do I find which lines in my program were executed the most times?
     Compile your program with basic-block counting enabled, run it,
     then use the following pipeline:

          gprof -l -C OBJFILE | sort -k 3 -n -r

     This listing will show you the lines in your code executed most
     often, but not necessarily those that consumed the most time.

How do I find which lines in my program called a particular function?
     Use `gprof -l' and lookup the function in the call graph.  The
     callers will be broken down by function and line number.

How do I analyze a program that runs for less than a second?
     Try using a shell script like this one:

          for i in `seq 1 100`; do
            fastprog
            mv gmon.out gmon.out.$i
          done
          
          gprof -s fastprog gmon.out.*
          
          gprof fastprog gmon.sum

     If your program is completely deterministic, all the call counts
     will be simple multiples of 100 (i.e. a function called once in
     each run will appear with a call count of 100).